Introducing glycol into lubricating oils exposes your machines to a powerful and poisonous mixture of chemicals. Unlike other harmful contaminants such as water and dirt, the destructive potential of glycol can progress to massive failure of machine components in a narrow window of time.

There could hardly be a more important role for the oil analyst than the routine screening of lubricating oils for the presence of glycol. One large oil analysis laboratory that specializes in heavy-duty fleet equipment deployed in mining and construction reported that glycol was found in 8.6 percent of motor oil samples over a period of years – about one in 12 samples.

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Spherical particles have been found in microscopic analysis in many different machines. The phenomenon of perfectly round spheres has been a topic of interest since their discovery and a number of theories have been formulated for their origin.

While more than one theory exists, their source can be narrowed down by considering certain factors such as particle size and texture, equipment type, surrounding debris, stage of equipment life and environmental conditions. Table 1 summarizes the predominant theories of the origin of spheres in oil analysis.

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